Ramayana
महर्षींस्तु पुरत्कृत्य प्रयान्तु तव सौनिकाः । यथा ग्रीष्मावशेषेण तरेयुर्जाह्नवीजलम् ॥ 7-64-11 ॥
Let your soldiers set out placing the great sages at their head, so that they may cross the waters of the Ganga while a remnant of summer still remains.
english translation